I got a radio and CD player installed today I'm going to tell you they are no room at all for speakers. I'm going to the rodrun on September 14th at Pigeon Forge Tennessee which I have a friend making a custom system that he's going to be installing in the bed of the truck. id like to see some other peoples custom systems installed in your 60-66 Chevy truck.I don't listen to rap music so he is setting mine up for rock music. I don't know a lot about radio systems. Subs, tweeters, amps, 12 inch speakers, 10 speakers. I'll take lots of photos when he gets mine built and installed. lets see some of your custom audio system